Determinaţi numărul atomic pentru elemetele situate în: a) grupa a II-a A, perioada 2;
b) grupaa V-a A, perioada 3;
c) grupa a II -a A, periada 4;
d) grupa a VI-a A, perioada 3.

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin